lec20 - Lecture 20 P112 Mar 5, 2008 Agenda for today...

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Lecture 20 P112 Mar 5, 2008
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Agenda for today • Conservative and non-conservative forces • Conservation of energy • Energy diagrams
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Which ball gets to the end first? 1 2 3. Same time
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Force, Work: Reminder • Last time: talked about work done by a force on a particle during a displacement • Variable force F (x): • Constant force F:
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Conservative forces • Work done by a conservative force does not depend on the path taken. • Which of these forces are conservative? – Gravitational force – Spring force – Friction force – Drag force
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Non-conservative Forces: Friction • Since the force is constant in magnitude and opposite in direction to the displacement, the work done in pushing the box through an arbitrary path of length L is just W f = - μ mgL . • work done depends on the path taken. W path 2 > W path 1 A B path 1 path 2
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We have seen that the work done by a conservative force does not depend on the path taken. W
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This note was uploaded on 04/16/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell University (Engineering School).

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lec20 - Lecture 20 P112 Mar 5, 2008 Agenda for today...

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